Overview
- A Monash‑led meta‑analysis published 5–6 August 2026 compiled 6,182 range‑shift records for 1,758 butterfly species across 105 countries and found that about 80% of reported shifts were linked to climate change and extreme weather.
- The study reports that roughly 80% of documented species expanded their ranges while 27% contracted and 22% changed elevation, with horizontal expansions recorded on every continent where butterflies occur.
- Regional patterns differ: tropical countries showed particularly high rates of expansions, temperate regions recorded more contractions, and elevational shifts were concentrated in the Northern Hemisphere.
- The authors warn the dataset is biased because expansions are easier to detect than disappearances, many records cluster in lowlands and near cities, and major tropical hotspots such as Central Africa, Southeast Asia, New Guinea and the Amazon remain severely under‑sampled.
- Researchers say conservation must shift from protecting only historical habitats to protecting future ranges, ecological corridors and multilingual, standardized monitoring so species and people relying on pollination and ecosystem services can adapt.